Electric vehicle automatic transmission system and method

Abstract

The invention relates to an electric vehicle automatic transmission system, wherein a vehicle controller (28) comprises a accelerator pedal signal acquisition device (29) and is connected with the circuits of an automatic transmission controller (25) and a drive motor controller (26) respectively; the drive motor controller is connected with the circuits of the automatic transmission controller (25) and a battery management device (27); the automatic transmission controller (25) contains a vehicle speed signal acquisition device (30), a shifting handle gear-D position signal acquisition device and a shifting fork reverse gear position signal acquisition device; preferredly, the automatic transmission controller also contains an adjustable speed motor, the circuit of the drive motor controller is connected with the adjustable speed motor; and the adjustable speed motor is used to connect with the input shaft of the drive motor. By using the system of the invention, the gear can be shifted according to the vehicle driving situation, thus expanding the working region of the drive motor and ensuring that the drive motor can always work in the ideal region,. Therefore, the dynamic property and economy of the electric vehicle can be increased, the cost performance of the electric vehicle can be greatly increased, the design is delicate, the structure is simple, and the system is convenient to use and suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of automobile power transmission systems, in particular to the technical field of electric vehicle power transmission systems, and specifically refers to an automatic transmission system and automatic transmission method for electric vehicles, which can adapt to external conditions and greatly improve the power and economy of electric vehicles. Background technique [0002] With the rise of fuel prices and the continuous enhancement of people's awareness of environmental protection, countries all over the world are looking for a renewable and clean alternative energy. Electric energy is a renewable clean energy recognized by the world. Because of its "zero" emission characteristics, electric vehicles have a very wide operating range of variable frequency traction motors, and their constant torque at low speeds and constant power at high speeds are very suitable for the needs of vehicle operation. Therefore, ...

AI Technical Summary

Problems solved by technology

However, the driving motor of electric vehicles is in the low-efficiency area in most cases, which will waste precious battery energy and reduce the driving range

According to the driving characteristics of electric vehicles, the driving motor should not only provide high instantaneous torque in the constant torque area, but also provide high operating speed in the constant power area to meet the high-speed requirements and acceleration climbing requirements of the vehicle. Under the current technical conditions, it is difficult for electric vehicle drive motors to meet such requirements

[0004] For high-end electric vehicles, clutches and traditional manual transmissions are generally used to change gears. The operation is complicated and the driver's labor intensity is high. It is inappropriate to configure it on electric vehicles that emphasize automation and intelligence.

In addition, the clutch and transmission will greatly increase the cost of electric vehicles and the volume of the front cabin, which is not conducive to the miniaturization of electric vehicles

However, it is more difficult to use the drive motor speed regulation technology to assist in switching gears, and the requirements for the drive motor control system are too high, and the feasibility is low.

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